Now that's one heck of a piggyback.
NASA's Shuttle Carrier Aircraft (SCA), a modified Boeing 747, carries the Phantom Ray unmanned combat air vehicle on a test flight in the skies above St Louis, Missouri, on December 13.
The 50-minute flight marked the first time in the SCA's 33-year history that it had carried anything other than a space shuttle orbiter on its back. Its systems were monitored from an observation plane and the following day, the SCA and Phantom Ray completed the 2897-kilometer journey to Edwards Air Force Base in California, where the jet will make a series of test flights under its own power.
The unloaded Phantom Ray, together with the specially-engineered cradle attaching it to the SCA, weigh 13,608 kilograms - considerably less than the porky shuttle orbiter, which weighs 99,790 kilograms.
The stealth jet has a cruise speed of 988 km/h, with an operating altitude of 12,192 metres. Its F404-GE-102 engine can deliver 78.7 kilonewtons of thrust at sea level. The air force will use it to try out new technologies over 10 test flights over the next 6 months.
The plane will support missions that "may include intelligence, surveillance, and reconnaissance; suppression of enemy air defenses; electronic attack; hunter/killer; and autonomous aerial refelling" according to Boeing Defense, Space & Security.
Pilots are becoming obsolete.